... threaded flange, slip-on flange (SO), socket welding flange, lap joint flange (LJF), welding neck flange (WNF), blind flange, orifice ... keep its leakproofness; convenient for replacing pipe line; easy to separate and check the situation of pipe line ... , chemical industry, nuclear power station, food manufacturing, construction, shipbuilding, paper making, medicine and other industries. 13.Payment:L/C,T ...